What is SDMA (SDMA)?
By Isabella Harris
What is SDMA (SDMA)?
SDMA users are assigned shaping and precoding matrices based on their multiantenna channels, allowing them to use the same frequency band at all times. One realization of SDMA is the use of multiple antenna sectors at the BS, so that users in different sectors can be assigned the same time-frequency resource.
How does the central scheduler work in srma?
The central scheduler manages a queue of requests and informs the terminal of its allocated time. In SRMA, the available bandwidth is divided into two channels, one used to transmit control information and the second used for the data messages themselves. The request channel is operated in a random access mode (ALOHA or CSMA).
How many subchannels does spade use?
The satellite SPADE system, for example, has a pool of FDMA subchannels that are allocated on request. It uses one subchannel operated in a TDMA fashion with one slot per frame permanently assigned to each user to handle the requests and releases of FDMA circuits.
